Implemented channel ownership transfer

TelegramCore.xcodeproj/project.pbxproj

@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		0900555621E4A96E0030924C /* Wallpaper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900555521E4A96D0030924C /* Wallpaper.swift */; };
 		09028386218E5DBB0067EFBD /* ManagedVoipConfigurationUpdates.swift in Sources */ = {isa = PBXBuildFile; fileRef = 09028385218E5DBB0067EFBD /* ManagedVoipConfigurationUpdates.swift */; };
+		090E778322A9862100CD99F5 /* ChannelOwnershipTransfer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 090E778222A9862100CD99F5 /* ChannelOwnershipTransfer.swift */; };
 		093857A82243D87900EB6A54 /* ManagedSynchronizeEmojiKeywordsOperations.swift in Sources */ = {isa = PBXBuildFile; fileRef = 093857A62243D87800EB6A54 /* ManagedSynchronizeEmojiKeywordsOperations.swift */; };
 		093857A92243D87900EB6A54 /* SynchronizeEmojiKeywordsOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 093857A72243D87900EB6A54 /* SynchronizeEmojiKeywordsOperation.swift */; };
 		093857AB2243D88D00EB6A54 /* EmojiKeywords.swift in Sources */ = {isa = PBXBuildFile; fileRef = 093857AA2243D88C00EB6A54 /* EmojiKeywords.swift */; };
@@ -829,6 +830,7 @@
 /* Begin PBXFileReference section */
 		0900555521E4A96D0030924C /* Wallpaper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Wallpaper.swift; sourceTree = "<group>"; };
 		09028385218E5DBB0067EFBD /* ManagedVoipConfigurationUpdates.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ManagedVoipConfigurationUpdates.swift; sourceTree = "<group>"; };
+		090E778222A9862100CD99F5 /* ChannelOwnershipTransfer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChannelOwnershipTransfer.swift; sourceTree = "<group>"; };
 		093857A62243D87800EB6A54 /* ManagedSynchronizeEmojiKeywordsOperations.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ManagedSynchronizeEmojiKeywordsOperations.swift; sourceTree = "<group>"; };
 		093857A72243D87900EB6A54 /* SynchronizeEmojiKeywordsOperation.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SynchronizeEmojiKeywordsOperation.swift; sourceTree = "<group>"; };
 		093857AA2243D88C00EB6A54 /* EmojiKeywords.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = EmojiKeywords.swift; sourceTree = "<group>"; };
@@ -2004,6 +2006,7 @@
 				D0633CD12253A528003DD95F /* ChatOnlineMembers.swift */,
 				D015E00D225CA61100CB9E8A /* FindChannelById.swift */,
 				D076F8882296D8E9004F895A /* ManageChannelDiscussionGroup.swift */,
+				090E778222A9862100CD99F5 /* ChannelOwnershipTransfer.swift */,
 			);
 			name = Peers;
 			sourceTree = "<group>";
@@ -2171,6 +2174,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = D09D8BF71D4FAB1D0081DBEC;
@@ -2234,6 +2238,7 @@
 				D00D34451E6EDD420057B307 /* SynchronizeConsumeMessageContentsOperation.swift in Sources */,
 				D02D60AB206BA64100FEFE1E /* VerifySecureIdValue.swift in Sources */,
 				D00D343F1E6ED6E50057B307 /* ConsumableContentMessageAttribute.swift in Sources */,
+				090E778322A9862100CD99F5 /* ChannelOwnershipTransfer.swift in Sources */,
 				D03B0CE01D62249100955575 /* StoreMessage_Telegram.swift in Sources */,
 				D08774FE1E3E3A3500A97350 /* GlobalNotificationSettings.swift in Sources */,
 				D023E67821540624008C27D1 /* UpdateMessageMedia.swift in Sources */,

TelegramCore/ChannelOwnershipTransfer.swift

@@ -0,0 +1,84 @@
+import Foundation
+#if os(macOS)
+import SwiftSignalKitMac
+import PostboxMac
+#else
+import SwiftSignalKit
+import Postbox
+#endif
+
+public enum ChannelOwnershipTransferError {
+    case generic
+    case twoStepAuthMissing
+    case twoStepAuthTooFresh(Int32)
+    case authSessionTooFresh(Int32)
+    case requestPassword
+    case invalidPassword
+}
+
+public func updateChannelOwnership(postbox: Postbox, network: Network, accountStateManager: AccountStateManager, channelId: PeerId, memberId: PeerId, password: String?) -> Signal<Void, ChannelOwnershipTransferError> {
+    return postbox.transaction { transaction -> (channel: Peer?, user: Peer?) in
+        return (channel: transaction.getPeer(channelId), user: transaction.getPeer(memberId))
+    }
+    |> introduceError(ChannelOwnershipTransferError.self)
+    |> mapToSignal { channel, user -> Signal<Void, ChannelOwnershipTransferError> in
+        guard let channel = channel, let user = user else {
+            return .fail(.generic)
+        }
+        guard let apiChannel = apiInputChannel(channel) else {
+            return .fail(.generic)
+        }
+        guard let apiUser = apiInputUser(user) else {
+            return .fail(.generic)
+        }
+        
+        let checkPassword: Signal<Api.InputCheckPasswordSRP, ChannelOwnershipTransferError>
+        if let password = password, !password.isEmpty {
+            checkPassword = twoStepAuthData(network)
+            |> mapError { _ in ChannelOwnershipTransferError.generic }
+            |> mapToSignal { authData -> Signal<Api.InputCheckPasswordSRP, ChannelOwnershipTransferError> in
+                if let currentPasswordDerivation = authData.currentPasswordDerivation, let srpSessionData = authData.srpSessionData {
+                    guard let kdfResult = passwordKDF(password: password, derivation: currentPasswordDerivation, srpSessionData: srpSessionData) else {
+                        return .fail(.generic)
+                    }
+                    return .single(.inputCheckPasswordSRP(srpId: kdfResult.id, A: Buffer(data: kdfResult.A), M1: Buffer(data: kdfResult.M1)))
+                } else {
+                    return .fail(.twoStepAuthMissing)
+                }
+            }
+        } else {
+            checkPassword = .single(.inputCheckPasswordEmpty)
+        }
+        
+        return checkPassword
+        |> mapToSignal { password -> Signal<Void, ChannelOwnershipTransferError> in
+            return network.request(Api.functions.channels.editCreator(channel: apiChannel, userId: apiUser, password: password))
+            |> mapError { error -> ChannelOwnershipTransferError in
+                if error.errorDescription == "PASSWORD_HASH_INVALID" {
+                    if case .inputCheckPasswordEmpty = password {
+                        return .requestPassword
+                    } else {
+                        return .invalidPassword
+                    }
+                } else if error.errorDescription == "PASSWORD_MISSING" {
+                    return .twoStepAuthMissing
+                } else if error.errorDescription.hasPrefix("PASSWORD_TOO_FRESH_") {
+                    let timeout = String(error.errorDescription[error.errorDescription.index(error.errorDescription.startIndex, offsetBy: "PASSWORD_TOO_FRESH_".count)...])
+                    if let value = Int32(timeout) {
+                        return .twoStepAuthTooFresh(value)
+                    }
+                } else if error.errorDescription.hasPrefix("SESSION_TOO_FRESH_") {
+                    let timeout = String(error.errorDescription[error.errorDescription.index(error.errorDescription.startIndex, offsetBy: "SESSION_TOO_FRESH_".count)...])
+                    if let value = Int32(timeout) {
+                        return .authSessionTooFresh(value)
+                    }
+                }
+                return .generic
+            }
+            |> mapToSignal { updates -> Signal<Void, ChannelOwnershipTransferError> in
+                accountStateManager.addUpdates(updates)
+                return.complete()
+            }
+        }
+    }
+}

TelegramCore/ManageChannelDiscussionGroup.swift

@@ -7,7 +7,6 @@ import SwiftSignalKit
 import Postbox
 #endif
 
-
 public enum AvailableChannelDiscussionGroupError {
     case generic
 }